Convert Images Online
Convert JPG, PNG and WebP images locally in your browser. Preserve transparency when supported, choose a background for JPEG, and download files individually or as a ZIP.
What this tool does
NexKit Image Converter changes supported JPG, PNG, and static WebP images into JPEG, PNG, or WebP directly in your browser. One output format is applied to the whole batch so single-image and multi-image workflows stay predictable.
The tool converts format only. It keeps the browser-decoded width and height unchanged and does not resize, crop, stretch, pad, rotate, or add borders. A file can become smaller, larger, or about the same size depending on the selected output format and image content.
How to convert images
Open the Image Converter page, choose one or more JPG, PNG, or static WebP files, and select JPEG, PNG, or WebP as the output format. JPEG and WebP use the quality setting; PNG output is browser Canvas re-encoding and does not have precise quality control.
When converting transparent PNG or WebP files to JPEG, choose the background color that should appear behind transparent and semi-transparent pixels. Run conversion, then download each result or package successful and kept outputs as a ZIP.
Supported formats
This release accepts JPG, PNG, and static WebP images and outputs JPEG, PNG, or WebP. GIF, SVG, HEIC, HEIF, AVIF, TIFF, BMP, unknown formats, animated WebP preservation, PDF conversion, and image-to-PDF workflows are not part of this tool.
File type checks use image headers as well as browser metadata, so a fake extension alone is not enough to pass validation. If a selected image is already in the target format, the original file is kept instead of being needlessly re-encoded.
Transparency and JPEG background
PNG and WebP outputs keep transparent pixels through the browser Canvas workflow when the source image has alpha. JPEG does not support transparency, so transparent areas are composited over the selected background color before JPEG encoding.
Canvas re-encoding usually does not preserve original EXIF, GPS, or ICC metadata. Image Converter is not a dedicated metadata removal or metadata preservation workflow.
Privacy and local processing
Images are converted locally in your browser for this tool. NexKit does not upload selected images to a server, store image blobs in browser storage, or send file contents to a cloud conversion service for this workflow.
Files remain part of the current browser session. Refreshing or closing the page clears the selected files and generated Blob URLs.
Frequently Asked Questions
Are my images uploaded?
No. Image Converter processes supported images locally in your browser. The selected files are not uploaded to NexKit servers by this tool.
Which input formats are supported?
This tool accepts JPG, PNG, and static WebP images. GIF, SVG, HEIC, HEIF, AVIF, TIFF, BMP, and unknown formats are rejected.
Which output formats are supported?
You can convert the whole batch to JPEG, PNG, or WebP. One target format is applied to all selected images in this MVP.
What happens to transparent areas when converting to JPEG?
JPEG does not support transparency. Transparent and semi-transparent pixels are composited over the selected background color before JPEG encoding.
Does converting change image dimensions?
No. Convert Image keeps the browser-decoded width and height unchanged. It does not resize, crop, stretch, pad, or add borders.
Why did the converted file become larger?
Changing formats and browser Canvas re-encoding can make a file smaller, larger, or about the same size depending on image content and the selected output format.
Does conversion preserve metadata?
Canvas re-encoding usually does not preserve original EXIF, GPS, or ICC metadata. This tool is not a dedicated metadata remover and does not guarantee every metadata case.
Can I convert multiple images?
Yes. You can process multiple supported images with one shared output format and download each output individually or together as a ZIP.
Can I download all results as a ZIP?
Yes. The ZIP download includes successful converted files and same-format originals that were kept. It is generated locally in your browser.
What happens if an image is already in the selected format?
The original file is kept and marked as already in the selected format. It is not needlessly re-encoded or recompressed.